<h3><u>Answer;</u></h3>
Element
<h3><u>Explanation;</u></h3>
Oxygen is an element and not a compound.
Elements are substances that can't be split into simpler substances by chemical means. They include, hydrogen, oxygen, sodium, etc.
Compounds are substances that are made up of two or more elements e.g. water is a compound, since it is made up of oxygen and hydrogen element. Compounds unlike elements can be split into simpler substances by chemical means.
2NH3 + H2SO4 = (NH4)2 + SO4
I'm guessing its Sublimation point of water
Hope this helps
<u>Answer:</u> The concentration of 
solution will be 0.094 M.
<u>Explanation:</u>
To calculate the concentration of acid, we use the equation given by neutralization reaction:
where,
are the n-factor, molarity and volume of acid which is
are the n-factor, molarity and volume of base which is 
We are given:
Conversion factor: 1L = 1000 mL
Putting values in above equation, we get:
Hence, the concentration of solution will be 0.094 M.
